I had to read it several times to get it, but I think they’re referring to “dumb” which could also refer to people who can’t speak. The funny thing about this

I had to read it several times to get it, but I think they’re referring to “dumb” which could also refer to people who can’t speak. The funny thing about this is that I simply read “dumb” as “stupid” and didn’t make any connection to being mute - but thanks to the earlier comment I’ve now made the association. So, well done policing the discourse, I guess?